docs: def father(year=None):
      """
      the 3rd Sunday in June
      :param year: int
      :return: Father's day
      """
      june_first = datetime.date(_year, 6, 1) if not year else datetime.date(int(year), 6, 1)
      weekday_seq = june_first.weekday()
      return datetime.date(june_first.year, 6, (21 - weekday_seq))